Combined features in the primordial spectra induced by a sudden turn in two-field DBI inflation

Shuntaro Mizuno*, Ryo Saito, David Langlois

*この研究の対応する著者

研究成果: Article査読

12 被引用数 (Scopus)

抄録

We investigate the features generated by a sharp turn along the inflationary trajectory in a two-field model of Dirac-Born-Infeld inflation, where one of the fields is heavy. Distinct features are generated by two different effects: the mixing of the light and heavy modes during the turn, on the one hand, and the resonance between the oscillations along the heavy direction after the turn, on the other hand. Contrary to models with standard kinetic terms, the resonance effect is not strongly suppressed because the action contains derivative interactions. Working in the potential basis, we study the oscillations after the turn and compute the amplitude of the mixing and resonance features in the power spectrum, as well as in the bispectrum for the latter effect. We find that the amplitudes and positions of these combined features obey specific consistency relations, which could be confronted with cosmological data.

本文言語English
論文番号032
ジャーナルJournal of Cosmology and Astroparticle Physics
2014
11
DOI
出版ステータスPublished - 2014 11月 1
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学

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